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Error - 'Invoice reference number has already been used' when changing the invoice reference for a purchase invoice in the batch

The problem is caused by a setting in the Purchase Ledger Options which can be disabled as follows:

  1. Click System, then click Options.

  2. Click Purchase Ledger Options.

  3. Click Edit.

  4. Clear the Prevent Duplicate Purchase Invoice Numbers check box.

  5. Click Save.

📌 Note: After changing the invoice number in the batch, re-enable this option to prevent further duplicate entries.

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